Google Git
Sign in
chromium / chromiumos / third_party / usb / um_ppm / refs/heads/main
commite2628f18285cac716c020781433481fc7e587e77[log] [tgz]
authorAbhishek Pandit-Subedi <abhishekpandit@google.com>Thu Feb 01 00:57:05 2024
committerAbhishek Pandit-Subedi <abhishekpandit@google.com>Fri Feb 02 17:44:42 2024
tree6863ba2f2ea2570ae1e0e7c303de96afdc5a316b
parent0bf8416a4eb7c0b15bb32a985ca3d37663d606f2 [diff]
Fixup ppm_tests missing include

BUG=b:319124643
TEST=make local_tests

Change-Id: Id0ebba8b0deb25cfa2dba149317a3f297f75d8f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/usb/um_ppm/+/5255582
Tested-by: Abhishek Pandit-Subedi <abhishekpandit@google.com>
Reviewed-by: Pavan Holla <pholla@google.com>
1 file changed
tree: 6863ba2f2ea2570ae1e0e7c303de96afdc5a316b
  1. include/
  2. test/
  3. .clang-format
  4. .gitignore
  5. LICENSE
  6. main.c
  7. Makefile
  8. platform_usermode.c
  9. ppm_common.c
  10. ppm_common.h
  11. README.md
  12. rts5453.c
  13. rts5453.h
  14. rts5453_usermode.c
  15. smbus_usermode.c
  16. smbus_usermode.h
  17. um_ppm_chardev.c
  18. um_ppm_chardev.h
README.md

Usermode PPM implementation

Usermode UCSI PPM implementation for evaluation and testing usage. Try using this with the ucsi_um_test kernel driver.

Setup

For usermode implementations, we use libi2c and libgpiod to provide an smbus implementation. You will need the right libraries to build:

sudo apt-get install libi2c-dev libgpiod-dev

Architecture

┌─────────┐
│OPM      │
│kernel or│
│cli      │
└────┬────┘
     │
     │
     ▼          ┌───────────┐
 ┌────────┐     │ PD Driver │
 │        ├────►│           │
 │  PPM   │     ├───────────┤
 │        │     │           │
 └────────┘     │ I2C Driver│
                └───────────┘

The usermode ppm implementation consists of the PPM task, the PD driver and the I2C driver backing it. The OPM will either be a CLI (for locally triggering some functionality) or the ucsi_um_test kernel module.